Add two new AVX512 subfeatures support for KVM guest.

AVX512_4VNNIW:
Vector instructions for deep learning enhanced word variable precision.

AVX512_4FMAPS:
Vector instructions for deep learning floating-point single precision.
Reviewed-by: NBorislav Petkov <bp@suse.de>
Signed-off-by: NHe Chen <he.chen@linux.intel.com>
Signed-off-by: NLuwei Kang <luwei.kang@intel.com>
[Changed subject tags.]
Signed-off-by: NRadim Krčmář <rkrcmar@redhat.com>